If the protocols and data are completely isolated, and features differ in many ways, why combine them in a single App? There's a chance a user might accidentally leak sensitive info over the anonymous mode.
The two modes are in one app for convenience, but they are separate systems. IMO, the risk is not data leaking between mode protocols/DHT, but rather the user linking their identity between the modes through their behavior - reusing usernames, same contacts... So in short, it's ease of use vs the risk of user error